Wearing sunglasses while you drive could land you with a £2,500 fine and nine points on your licence.

And - bizarrely - so could NOT wearing sunglasses while driving.

Rule 237 of the Highway Code states that drivers must slow down or pull over if dazzled by bright sunlight - so if you don't, and you're not wearing sunglasses to protect you from the glare then you could be convicted of careless driving.

The offence means an on-the-spot fine of £100 and up to three penalty points on your licence - or you could go to court and face up to £2,500 in a fine and nine points.

But it is also illegal to wear some types of sunglasses while driving.

Sunglasses are divided into four categories based on how much light they filter out.

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Variable tint lens sunglasses are also not suitable for driving. The tint on these glasses becomes darker when exposed to sunlight, but modern car windscreen glass filters out UV rays and means they won't work.

According to the AA: "Filter category 4 lenses only transmit between 3 per cent and 8 per cent of light and are not suitable for driving at any time.